[schade]

i'm pretty sure that by installing a tach adapter it well void your warrenty aswell seeing as you have to splice into the wires at the coil packs. So either way your warrenty could be gone depending on the dealer.

but i could be wrong.

If you want to go a route that MIGHT not void your warrenty there is a tach that is pretty simple to hook up. You just run a wire wrapped around on of the spark plug wires and thats all. I don't know how accurate it would be though as i've never tried it nor heard of anyone that has run it

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